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Figure 2: The COG functional categorization of differentially expressed genes in response to heat shock stress in Clostridium botulinum ATCC 3502. The number in parentheses showed the total number of genes classified in each COG functional category in Clostridium botulinum ATCC 3502. The bar diagram represented the percentage of differentially expressed genes (including upregulated and down-regulated genes) relative to the total number of genes in each COG functional category. The number beside the bar diagram indicated the percentage of differentially expressed genes in each COG functional category relative to the total number of differentially expressed genes under heat shock stress.